JavaScript Math.ceil( ) function

The Math.ceil() function in JavaScript is used to round the number passed as a parameter to its nearest integer in an Upward direction of rounding i.e towards the greater value.

Syntax :

Math.ceil(value)

Parameters: This function accepts a single parameter as the number to be rounded to its nearest integer in the upward rounding method. 

Returns: Result after rounding the number passed as a parameter to the function.

Examples:

Input  : Math.ceil(4.23)
Output : 5

Input  : Math.ceil(0.8)
Output : 1

Errors and Exceptions:

• A non-numeric string passed as parameter returns NaN
• An array with more than 1 integer passed as parameter returns NaN
• An empty variable passed as parameter returns NaN
• An empty string passed as parameter returns NaN
• An empty array passed as parameter returns NaN

Below are some examples that illustrate the Math.ceil() function in JavaScript:
Example: 1

Javascript

<!-- NEGATIVE NUMBER EXAMPLE -->
<script type="text/javascript">
    console.log(Math.ceil(-2) + "<br>");
    console.log(Math.ceil(-2.56));
</script>

Output:

-2
-2

Example:2

Javascript

<!-- POSITIVE NUMBER EXAMPLE -->
<script type="text/javascript">
    console.log(Math.ceil(2) + "<br>");
    console.log(Math.ceil(2.56));
</script>

Output:

2
3

Example :3

Javascript

<!-- STRING EXAMPLE -->
<script type="text/javascript">
    console.log(Math.ceil("Geeksforgeeks"));
</script>

Output:

NaN

Example:4

Javascript

<!-- ADDITION INSIDE FUNCTION EXAMPLE -->
<script type="text/javascript">
    console.log(Math.ceil(7+9));
</script>

Output:

16

Supported Browsers: The browsers supported by JavaScript Math.ceil( ) function are listed below: 

• Google Chrome 1 and above
• Internet Explorer 12 and above
• Firefox 1 and above
• Opera 3 and above
• Safari 1 and above